Power pack



3, 1931- R. D. slRAGUsA File'd Jan. 231- 1929 Patented Mar. 3, 1931 PATENT OFFICE ROSS DAVID SIRAGUSA, F CHICAGO, ILLINOIS POWER PACK rApplication yfiled January 23, 1929. Serial No. 334,543.

T his invention relates to a power pack and particularly to one wherein a transformer may be completely assembled in a casing ready for installation in electrical circuit and one which is especially useful in radio sets.

The invention contemplates also provision -for mounting a fuse in the casing in such manner as to be protected against damage and which at the same time allows ready removal and replacement cf the fuse.

An object of the invention is to provide a power pack casing with a recess for the reception of a fuse.

Another object of the invention is to provide a unitary encased transformer assembly which may be attached to a ysupport and connected in circuit outwardly of the case.

A further object of the invention is to provide an incased transformer pack having ak fuse arranged inwardly ofthe casing in such manner that the fuse may be readily removed and replaced.

The above, other and further objects of the invention will be apparent from the following description, accompanying drawings and appended claims.

According to the invention a metallic casing having a depression in one side for a fuse is arranged to receive a transformer and when the transformer has been inserted and electrical connections made with lugs extending through the bottom of the casing, the interior of the same is filled with plastic insulating material and a cover placed over the casing so that the same is completely incased in metal. VAttaching screws or bolts are fastened in the'bottom of the casing and extend outwardly whereby the pack may be .40 readily mounted on a shelf or other support.

The form chosen to exemplify the invention is illustrated in the accompanying drawings and the views thereof areas follows:

Figure 1 is a front elevational' view of a transformer embodying the invention.

Figure 2 is a top plan view of the casing employed in the arrangement of Figure 1. Figure 3 is an enlarged fragmental partial sectional view showing details of construc- L50. tion.

Figure 4; is an enlarged transverse vertical sectional view through the pack.

Figure 5 is a fragmental sectional view showing the fuse recess.

The invention is directed to an A. C. power transformer familiarly known in the radio art as a power pack. The transformers are mounted in metal containers and embedded in sealing compounds and usually are not provided with fuses or other protective devices. G0 lt is usual practice when applying a power pack to a radio set to provide a fuse outwardly of the pack for protecting the transformer.

This invention is directedto the arrangement of a fuse in the power pack itself with the fuse in the primary transformer circuit and so arranged inwardly of the outer surface of the casing so that the pack may be assembled and shipped without danger of damage to the fuse. Y

The form of casing illustrated in the accompanying drawings includes a rectangular wall l of metal which has a cut-out 2 in the bottom side thereof which cut-out is substantially coextensive with the bottom. A back 3 of metal having a flange 4 thereabout is secured-to the ring 1 in any suitable manner, such as by welding or the like.

The top has a small cut-out 5 in which is sunk ametallic pocket- 6 which pocket is se- 80 cured in position by the flanges 7 thereof being outturn ed and welded or otherwise fastened tothe wall 1. The bottom of the pocket member 6 is provided with two spaced openings 8 and 9.

The marginal portion of the bottom of the wall 1 is provided with a plurality of open ings 10 and bolts or screws 11 are disposed in these openings to extend outwardly of the bottom. The screws are welded or otherwise secured in the openings 10 so as to be immovable with respect to the same.

A fuse support 11 of insulating material corresponding to the shape of the pocket or cup 6 is inserted in the pocket supplied with 9 two spaced fuse clips 12 and 13. The clips are secured in the insulating block 11 by fingers 14 crimped against the underside of the block. Each of the clips 12 and 13 has a conductor 15 passing through the block 11 and 'arrangement demands.

Y transformer inwardly of the casin tors may be joined either extending into the openings 8 and 9 of the pocket or cup 6 so that electrical connection may be made with these conductors when the transformer is assembled in the casing.

A bottom insulating block 16 is disposed in the bottomof the casing and is supported on the uncut portion of the bottom of the wall 1. rlfhe block 16 has recesses 17 formed in the same so as to surround the heads of the screws or bolts 11 to enable the block 1G to rest hun ly on the bottom of the wall l.

A plurality of connecting lugs 18 are fastened spaced intervals in the block 16. The lugs are formed from flat strips and then crimped in the metal against the toi and bottom surface of the block 1G aft-er the lugs have been passed through slits in the block. This arrangement positions the lugs '18 in vertical position so that connections may be made with various leads from the secondary of the and to enable external connections to these lugs outwardly of the casing.

The lugs are provided with marginal slots 2O and holes 21 so that the electrical conducin the slots or in the holes as desired.

rlhe fingers or lugs 15 of the fuse clips 12 and 13 may be of the same character as the lugs 18.

The fingers orlugs 15 of the fuse clips 12 and 13 are connected in the primary circuit of the transformer. The various terminals from the secondary winding of the transformer are connected to the several lugs 18 extending through the bottom of the pack.

A cover 22 similar in all respects to the back wall 3 is applied over the open space of the transformer casing after the transformer has been installed and electrically connected and the sealing compound applied. s

The structure resulting from a packcon- Y structed in accordance with this invention is compact, maybe read.'Yr

p assembled on a support by passing the screws 11 through suitable openings the support and applying nutsV to the screws and then connectinc` conductors to such of the lugs 18 as the particular wiring The provision of the fuse in the primary circuit of the transformer eliminates shorts in the transformer thus preventing burning out of the winding and also prevents melting of the sealing compound. l Y A The arrangement of the fuse A in the pocket or cup allows the fuse Yto be installed in the pack at the time of manufacture so that the pack may be readily shipped and assembled Without any damage resulting to the fuse.

. The fuse A is of any standard type suitable fl'fr connection with the Vspring clips 12 and The transformer windings have not been' of'standard arrangement consistent with the service the transformer is to render.

Certain of the lugs 18 are employed for supplying current to the primary winding of the transformer within the pack.

The fuse pocket or cup 6 may be arranged on any convenient portion of the pack and is not to be limited to arrangement on the top of the same as shown in the drawings as of course any other disposition of this may be made to suit the conditions of manufacture.

The fuse pocket or cup enables mounting of the fuse in a sunken recess within the plane of the case.

fine fuse recess may be covered by a'name pla e or other suitable cover pivoted or vise arranged over the same. will be observed that a pack constructed in acc.l rdance with this invention is compact, contained and arranged to be readily ,-.nted in coi nection with electric circuits. orovision of 'a fuse in a recess enables iransformer to be properly provided with able fuse at the time of manufacture which fuse is protected against damage in transit or use.

The fuse block 11 may be removably arranged within the pocket 6 instead of being fastened by the clips 14 as hereinabove mentioned Spring fingers 23 may be formed in the cup or pocket 6 to prevent displacement ofthe block 11 and its supported fuse A. ln such construction the clips lllwould not be used. Y

The invention has been described herein more or less precisely, yet it is to be understood that changes maybe made in the arrangement and proportion of parts and that equivalents may be substituted without de parting from the spirit and scope of the invention. f

The invention is claimed as follows:

1. In an arrangement for housing the transformer of an eliminator and the fuse thereof, a sheet metal rectangular box having an opening in one ,ofits sides, a flanged lsheet metall tray mounted on the Vside and the side and registering with the opening andA having its bottom inwardly of the plane of the side, Vmeansin the tray arranged t0 removably secure a fuse. inwardly of the plane of the side, vanother'side of the box having an opening therein, an insulating 'block' mounted on the last named side Within the box and registering with opening, the said insulating block having a slit formed therein, and a terminal positioned in the slit of the insulating block, the said terminal comprising a strip of conducting material having an intermediate portion doubly bent and pressed against the block whereby end portions extend normally on either side of the block.

3. In an arrangement for housing the transformer of an eliminator and the fuse therefor, a sheet metal rectangular box' having an opening in one of its sides, a flanged sheet metal tray mounted on the side and registering in the opening and having its bottom inwardly of the plane of the side, means arranged to secure the tray in position, the said means including a resilient tongue formed in a side Wall of the tray arranged to abut the under surface of the side of the box, and means in the tray arranged to removably secure a fuse inwardly of the plane of the side of the box.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

Illinois.

ROSS DAVID SIRAGUSA. 

